In Perpich v. Department of Defense, the Supreme Court held that Congress could authorize National Guard members to undertake active federal training outside the United States without a governor’s consent or a declared national emergency. The 1990 decision addressed that training authority and the Guard’s dual state-federal structure. It should not be summarized as a holding that every presidential federalization or domestic law-enforcement deployment is automatically lawful. [1]
Rules that determine the answer
Current law uses different authorities for different missions. Section 12406 permits specified federal call-ups involving invasion, rebellion, or the president’s inability with regular forces to execute federal law; its statutory conditions still require analysis. Section 325 generally relieves a Guard member from state Guard duty while the member serves on active federal duty, with a specified dual-status exception. [3] State active duty, federally funded Title 32 service, and Title 10 active duty should therefore not be treated as interchangeable. [2]
The distinction has practical force. In its December 23, 2025 Trump v. Illinois order denying a stay, the Supreme Court said “regular forces” in Section 12406(3) likely means the regular military and discussed the need for authority allowing military execution of the laws. The Court described its analysis at a preliminary stage; it was not a final merits decision approving or rejecting every possible call-up. [4] Individual members should obtain counsel about actual orders rather than infer a personal right to disregard them from a dispute between governments.
What to do next
- Read the actual order and identify the statute, duty status, mission, and effective dates.
- Separate a governor’s policy objection from a legal challenge to the authority or conditions for the particular call-up.
- Determine who commands the force under the relevant status and whether any dual-status authorization applies.
- For a live dispute, examine current court orders and legal advice rather than relying solely on a general description of the 1990 case.
Practical example
A governor objects to a federal overseas training exercise of the kind addressed in Perpich. That is different from a domestic call-up justified under Section 12406(3). The latter requires analysis of that provision and other legal limits, even though both situations involve members who also belong to a state Guard.
For related situations, see presidential National Guard call-up authority and governors and National Guard federalization.
Primary sources
- Perpich v. Department of Defense, 496 US 334 (1990)
- 10 USC 12406: statutory National Guard call-up conditions
- 32 USC 325: relief from state duty and dual-status exception
- Trump v. Illinois, December 23, 2025: Supreme Court stay order
Sources checked: October 31, 2026.